I imagine the e40 socket has to have some kind of base to it; why not just screw it onto a piece of wood, then use eye hooks to tie it up and suspend it.
Another idea is, if you wanna do some work, make a triangle out of 3 2x4s.
Here, I drew it in paint!
View attachment 1950878
Basically, screw the socket onto the wood triangle with two
U-Bolts, the bulb is free to float in the middle, and the
eye hooks give you a place to tie the light up.
I also discovered I'm God-awful at paint and should never try drawing with it.